TransactionWriteExample.java

/**
 *  Copyright 2007-2008 Konrad-Zuse-Zentrum für Informationstechnik Berlin
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
package de.zib.chordsharp.examples;

import com.ericsson.otp.erlang.OtpErlangList;
import com.ericsson.otp.erlang.OtpErlangObject;
import com.ericsson.otp.erlang.OtpErlangString;

import de.zib.chordsharp.ConnectionException;
import de.zib.chordsharp.TimeoutException;
import de.zib.chordsharp.Transaction;
import de.zib.chordsharp.TransactionNotFinishedException;
import de.zib.chordsharp.UnknownException;

/**
 * Provides an example for using the {@code write} method of the
 * {@link Transaction} class.
 * 
 * @author Nico Kruber, kruber@zib.de
 * @version 1.0
 */
@Deprecated
public class TransactionWriteExample {
	/**
	 * Writes all key/value pairs given on the command line (given as "key1
	 * value1 key2 value2 ...") with the
	 * {@link Transaction#write(String, String)} and
	 * {@link Transaction#write(OtpErlangString, OtpErlangObject)} methods in a
	 * single transaction.<br />
	 * If no key/value pair is given, the default pairs {@code (key1, value1)},
	 * {@code (key2, value2)} and {@code (key3, value3)} are used.
	 * 
	 * @param args
	 *            command line arguments (optional key/value pairs to store)
	 */
	public static void main(String[] args) {
		String[] keys;
		String[] values;

		if (args.length < 2 || args.length % 2 != 0) {
			keys = new String[] { "key1", "key2", "key3" };
			values = new String[] { "value1", "value2", "value3" };
		} else {
			keys = new String[args.length / 2];
			values = new String[args.length / 2];
			for (int i = 0; i < args.length;) {
				keys[i] = args[i++];
				values[i] = args[i++];
			}
		}

		OtpErlangString[] otpKeys_temp = new OtpErlangString[keys.length];
		for (int i = 0; i < keys.length; ++i) {
			otpKeys_temp[i] = new OtpErlangString(keys[i]);
		}
		OtpErlangList otpKeys = (new OtpErlangList(otpKeys_temp));

		OtpErlangString[] otpValues_temp = new OtpErlangString[values.length];
		for (int i = 0; i < values.length; ++i) {
			otpValues_temp[i] = new OtpErlangString(values[i]);
		}
		OtpErlangList otpValues = (new OtpErlangList(otpValues_temp));

		System.out.println("Writing values with the class `Transaction`:");

		System.out.print("    Initialising Transaction object... ");
		try {
			Transaction transaction = new Transaction();
			System.out.println("done");

			System.out.print("    Starting transaction... ");
			transaction.start();
			System.out.println("done");

			System.out
					.println("    `write(OtpErlangString, OtpErlangString)`...");
			for (int i = 0; i < otpKeys.arity(); ++i) {
				OtpErlangString key = (OtpErlangString) otpKeys.elementAt(i);
				OtpErlangString value = (OtpErlangString) otpValues
						.elementAt(i);
				try {
					transaction.write(key, value);
					System.out.println("      write(" + key.stringValue()
							+ ", " + value.stringValue() + ") succeeded");
				} catch (ConnectionException e) {
					System.out.println("      write(" + key.stringValue()
							+ ", " + value.stringValue() + ") failed: "
							+ e.getMessage());
				} catch (TimeoutException e) {
					System.out.println("      write(" + key.stringValue()
							+ ", " + value.stringValue()
							+ ") failed with timeout: " + e.getMessage());
				} catch (UnknownException e) {
					System.out.println("      write(" + key.stringValue()
							+ ", " + value.stringValue()
							+ ") failed with unknown: " + e.getMessage());
				}
			}

			System.out.println("    `write(String, String)`...");
			for (int i = 0; i < keys.length; ++i) {
				String key = keys[i];
				String value = values[i];
				try {
					transaction.write(key, value);
					System.out.println("      write(" + key + ", " + value
							+ ") succeeded");
				} catch (ConnectionException e) {
					System.out.println("      write(" + key + ", " + value
							+ ") failed: " + e.getMessage());
				} catch (TimeoutException e) {
					System.out.println("      write(" + key + ", " + value
							+ ") failed with timeout: " + e.getMessage());
				} catch (UnknownException e) {
					System.out.println("      write(" + key + ", " + value
							+ ") failed with unknown: " + e.getMessage());
				}
			}

			System.out.print("    Committing transaction... ");
			transaction.commit();
			System.out.println("done");
		} catch (ConnectionException e) {
			System.out.println("failed: " + e.getMessage());
			return;
		} catch (TransactionNotFinishedException e) {
			System.out.println("failed: " + e.getMessage());
			return;
		} catch (UnknownException e) {
			System.out.println("failed: " + e.getMessage());
			return;
		}
	}

}